Commutator and means for assembling same



(No Model.) I

S. H. SHORT.

GOMMUTATOR AND MEANS FOR ASSEMBLING SAME.

Patented Sept. 21,1897.

E 15 If]? UNTTED STATES PATENT OFFICE.

SIDNEY HONE SHORT, OF CLEVELAND, OHIO.

COMMUTATOR AND MEANS FOR ASSEMBLING SAME.

SPECIFICATION forming part of Letters Patent No. 590,466, datedSeptember 21, 1897.

Application filed JulylZ, 1897. smart. 644,226. (Nomodeld T (1. whom, itmay concern:

Be it known that I, SIDNEY'IIOWE SHORT, a citizen of the United States,residing at Cleveland, in the county of Ouyahoga and State of Ohio, haveinvented new and useful Oommutators and Means for Assembling the Same,of which the following is a specification.

This invention relates to commutators and means for assembling the same.

The object of the invention is to provide a construction and arrangementwherein the commutator-bars are efficiently assembled and supported andwherein a true and cylindrical external surface of the commutator ismaintained.

The invention consists, substanliall y, in the construction,combination, location, and relative arrangement, all as will be morefully hereinafter set forth, as shown in the accompanying drawings, andfinally as specifically pointed out in the appended claims.

Referring to the accompanying drawings and to the various views andreference-signs appearing thereon, Figure 1 is a central longitudinalsectional view of a commutator constructed and arranged in accordancewith the principles of my invention. Fig. 2 is an end view of the same,partly in transverse section. Fig. 3 is a detached broken detail view inplan of the inner supporting-ring and overlapping insulating-ring.

The same part is designated by the same reference-sign wherever itoccurs throughout the several views.

In the drawings reference-sign A designates the armature shaft, uponwhich is mounted the commutator hub or spider. This hub or spider may beof any suitable or desirable construction and arrangement adapting it asa support for the commutator-bars C. These bars are assembled into ringform in any suitable or convenient manner-for instance, as set forth inmy pending application, Serial No. 633,879, filed April 26, 1897- withthe interposed insulating-strips I), and the cylinder thus formed isslipped upon the peripheral portion of the supportinghub The commutatorend insulation E, suitably shaped to conform to the contour of the endsof the commutator-bars, is then arranged in place and clamped upon theends of the bars there can be no high bars.

by the commutator-heads F by means of bolts G.

In the construction of commutators it is ex ceedingly important that thecommutatorbars and the mica insulation between them be assembled into acylindrical form and pressure applied to the outside of the cylindricalbody, so as to force the commutator-bars and the mica together with avery great peripheral pressure, and while under this great peripheralpressure the commutator should be heated, so that any extra varnish inthe mica segments may be displaced, and as it flows out from between theplates of mica additional pressure may be applied so as to force thebars against the mica plates solidly. I11 order to accomplish this,there must be nothing on the inner portion of the commutatorcylinder toprevent the bars from traveling inward under the external pressure whichis being applied. WVhile the bars are held in this position, themounting must be applied in. such a Way as to clamp them firmly in theposition attained while they are on the assembling-jig. It is alsonecessary after clamping the commutator-cylinder onto its hub by meansof the end rings to provide a support or supports inside of the cylinderformed by the commutator-bars and mica, so that the individual barscannot move inwardly and produce what is known as low bars. Thecommutator end rings will of course prevent the bars from movingoutwardly and therefore Even after the commutator is completelyassembled there should still remain the circumferential pressplittingthese rings diagonallyI am enabled to compress them to a point wherethey may ,be radially inserted'in the oommutator-cyh inder. A strip orring of insulation I\', also preferably split diagonally, is interposedbetween the holding or supporting ring if and the inner surface of thecommutator-eylin der. By splitting the insulation-rings K diagonally, asshown at L, Fig. 3, I am enabled to readily compress said rin to a pointwhere they can be easily and readily inserted in thecommutator-eylinder. In practice the diagonal slot I; through theinsulating ring If is normallyof smaller extent than the diagonal slot Jin the holder-ring II when in its normal condition, as shown in Fig. 0.Therefore an efficient bearing of the insulationring against the innersurface of the commutator-bars and the point where the diagonal slotoccurs is constantly maintained and good surface insulation secured.

In order to secure the desired results, it is important to provide meansfor suitably expanding the holder-rings II after being placed inposition within the commutator-ring and after the commutator cylinderhas been placed in position uponits supporting spider or hub. It is alsoimportant that such expansion take place uniformly throughout the lengthof said holder-rings in order that the commutater-cylinder may be heldin truly concentric and peripheral cylindric relation with respect tothe axis of the armature A. To this end the spider or hub 13 isperipherally flanged, as at M, through which at suitable intervals aretapped radially set-screws N, having their ends arranged to abut againstthe inner surface of the holder-rings II. After the eommutator-cylinder,with the holderrings arranged in place therein, is placed in position onthe hub or spider by suitably and successively turning up on the setnutsN the holder-rings are expanded against the inner surface of thecommutator cylinder, thus forming an efficient support for the commietator-c'ylindcr, holding the connnutaior-bars in proper relation,preventing the individual bars from being driven in, thus disturbing thetrue cylindrical external surface of the commutator and enabling thecommutator to be rapidly and easily assembled in proper position uponits supporting-hub.

In order that the holderrings II may not interfere with theclamping-bolts (l, by w hieh the head-plates F are clamped upon the endsof the commutator-cylinder, I provide seats or recesses l in theperipheral surface of the flanges M, in which said clamping-bolts arereceived below the surface of such flanges, as clearly shown in Fig. 2,thereby enabling the commutator-cylindcr, with the holder-rings, to bereadily and easily slipped thereover.

It is desirable to provide means for holding the sct-scrcws N againstrelative turning after they are once properly adjusted. As

illustrative of simple and e'fiicient means for accomplishing thisobject I have shown holes or perforations It, drilled through the headsof said screws, through which I pass holding wires or rods S. Inpractice it is sufficient l i t l l 1 that two m'ljaeent set-screws bethus locked i together.

llaviug now setforth the object and nature of my invention and a form ofapparatus em bodying the same and having described the construction,function, and mode of operation thereof, what I claim as new and usefuland of my own invention, and desire to secure by Letters Patent of theUnited States, is

.i. In a commutator, the combination with a hub or spider, a commutatorcylinder mounted thereon, and an expansiblo .ringin terposed betweensaid connnutator-cylinder and said hub, as and for the purpose setforth.

2. In a-commutator, a hub or spider, a commutatorcylinder mountedthereon, a split ring interposed between said commutator cylinder andsaid hub or spider, and means for expanding said split ring, as and forthe purpose set forth.

3. In a commutator, a hub or spider, a coinmutater-cylinder mountedthereon, a split ring interposed bet-ween said hub or spider and saidconnnutator-cylinder, andset'serews passed through said hub or spiderand impinging against said split ring, as and for the purpose set forth.

l. In a commutator, a hub or spider, a commutator-cylinder mountedthereon, a dingo nally-split ring interposed between the hub and thecomnuitator-cylinder and a diagonally-split ring of insulationinterposed be tween the split ring and the commutator-eylinder, as andfor the purpose set forth.

5. The combination with a hub or spider and a commutator-cylinder, of adiagonallysplit holder-ring and a diagonally-split insulation-ring, theslot in the insulation-ring be ing of smaller extent than that throughthe holder-ring, as and for the purpose setforth.

(3. The combination with a hub or spider having a grooved periphery, ofa eomniutatorcylinder mounted thereon, clamping-heads for said cylinderand securing-bolts for said heads, said bolts arranged to be received inthe grooves in said periphery, as and for the purpose set forth.

7. The combination with ahub or spider, having grooves in its outerperiphery, of a commutator cylinder mounted thereon, clamping-heads forsaid cylinder, SCGUL'iIIg bolts for said heads, said bolts arranged insaid grooves, and a holder-ring interposed between said hub or spiderand eonunutatow cylinder, as and for the purpose set forth.

8. In a commutator, a coinmutator-cyliuder, a supporting-hub therefor,said hub provided with a peripheral flange and an expansive ringinterposed between the outer surface of said peripheral flange and theinner surface of said coinmutator-cylinder, as and for the purpose setforth.

9. In a con'imutator, a counnutator-cylinder, a peripherally-ilangedsupporting-hub therefor, an expansive ring interposed between saidfiangc and commutator-cylinder, set-screws tapped through said flangeand IIO impinging against the inner surface of said split ring, as andfor the purpose set forth.

10. In a commutator, a 00mmutator-oylinder, a peripherally-flangedsupporting-hub therefor, an expansive ring interposed between saidflange and eoininutator-eyiinder,

set-screws tapped through said flange and impinging" against the innersurface of said split ring, and means forloeking said set-nuts

